Filter fabric for a plate and frame filter press for re-refining used oils



w. D. HARRIS 2,123,042

July 5, 1938.

FILTER FABRIC FOR A PLATE AND FRAME FILTER PRESS FOR RE-REF'ININGUSED OILS 'Original Filed Feb. 6, 1955 4 Sheets-Sheet 1 IN ENTQR.

ATTORNEY y 1938- v w. D. HARRIS 2,123,042

FILTER FABRIC FOR A PLATE AND FRAME FILTER PRESS FOR RE-REFINING USED OILS Original Filed Feb. 6, 1935 4 Sheets-Sheet 2 F G13. I9

' INVENTOR.

BY W

ATTORNEY.

July 5, 1938. w. D. HARRIS 2,123,042

FILTER FABRIC FOR A PLATE AND FRAME FILTER PRESS FOR RE-REFINING USED OILS Original'Filed Feb. 6, 1935 4 Sheets-Sheet 5 FIG. .5.

FIG. 6. /9

INVENTOR.

BMW E W ATTORNEY Jul 5, 1938 W. D. HARRIS FILTER FABRIC FOR A PLATE AND FRAME FILTER PRESS FOR RE REFlNlNGUsED OILS Original Filed Feb. 6, 1955 4 Sheets-Sheet 4 I gixog "ATLIORNEY,

Patented July 5, 1938 UNITED STATES PATENT OFFICE 'FILTER. FABRIC FOR A PLATE AND FRAIWE FILTER PRESS F OILS R RE-REFINING USED William D. Harris, Kansas City, Mo., assignor to Refinoil Manufacturing Corporation, Kansas City, Mo.

2 Claims.

My invention relates to the processes described in my copending application, Serial No. 5,172, of which this is a division. As described in that application the oil is first acid treated, then placed in a retort and the light ends and diluents vaporized in a vacuum. .The oil is then drawn off and carried to a plate and frame filter press. These presses have been used for some time in the filtering of oil, to separate the purified oil from the adsorbent material used to restore color, etc. to the oil.

My invention has for its principal object to provide a fabric by the use of which all of the fines which now pass through the fabric employed will be separated out and a more perfect separation obtained.

A further object is to, provide a fabric which will permit the operator, when the filtration has been completed, to lift the cake out without the least difficulty.

My means of attaining the foregoing objects may be more readily perceived by having refer: ence to the accompanying drawings which are hereunto annexed and are a part of this specification, in which Fig. 1 is a side elevation more or less diagrammatic of apparatus for filtering used oils;

Fig. 2 is an end view of the same;

Fig. 3 is a plan view of the interior with the cover removed;

Fig. 4 is a detail view of an end pressure plate (M);

Fig. 5 is a similar View of the end header plate (N);

Fig. 6 is a detail view of one of the center plates (L);

Fig. 7 is a similar view of a frame plate (K); and

Fig. 8 is an enlarged fragmentary detail view showing the use of the filter fabric.

Similar reference numerals refer to similar parts throughout the entire description.

As shown in the drawings, the filter cabinet I is formed with end, side, and bottom walls. A cover or lid 2 is provided to close the top and is secured. by a hinge 3. The lid is preferably reinforced with an angle iron which fits inside the front and side walls of the cabinet I. A chain 4 may be provided to prevent the lid 2 or cover from dropping backwards. A suitable handle 5 is mounted adjacent the front of the cover 2. Guide bars 6 and l are secured inside the cabinet I upon which slidably rests the frames and plates. A pressure screw 8 is mounted in a header 9 which is preferably welded to the front wall of the cabinet I. A hand wheel I0 is fixedly secured to the forward end of the screw 8. The inner end of said screw is rotatably attached to a front header pressure plate II. This plate is provided with outwardly extending lugs l2 and I3, the lower face of each lug is provided with a slot [4 which is fitted to and slides upon the guide bars 6 and 1. A rear header plate I5 is mounted adjacent the rear wall of the cabinet I and is provided with oil receiving chambers l6 and 11 to which may be secured pipe connections to convey the filtered oil to any desired container (not shown). The inner faces of these header plates II and I5 are provided with a series of grooves l8 which extend vertically and horizontally through which the oil will pass after it is pressed through the filter fabric. v are mounted a plurality of frame plates 22 and press plates I9. Intermediate each plate and frame I mount a filter fabric comprising a layer of canvas 20 which is next to the plate II or other suitable material, for example, and a layer of filter paper 2| which is next to the frame plate 22. In like manner I mount a layer of the paper 2| at the opposite side of the frame plate 22 and then a layer of canvas adjacent the press plate IS. The operation of the filter press is so well known to persons skilled in the art as to render a detailed description of the same unnecessary. My use of a combined filtering fabric of canvas and paper in a plate and frame press for filtering rerefined oil is novel and the results are highly beneficial for it not only filters out the fines which the canvas (used in standard practice) does not do but it also materially reduces the labor required in the operation for the paper enables the operator to remove the frames freely and thecakes formed by the residue will easily come out of the frames, the papers serving to maintain them in unbroken condition. This results in a substantial saving for labor while producing an unexcelled quantity of oil.

Having described my invention what I regard as new and desire to secure by Letters Patent is- 1. In a pressure filter for re-refined oils com- Intermediate the two headers II and I 5 i prising alternate open frames and grooved plates, a filter medium comprising paper overlying textile filtering fabric interposed between said plates, said paper being directly exposed to the supply of oil to be filtered whereby the resultant cake may be removed readily in substantially unbroken condition together with said paper.

2. A pressure filter for re-refined oils comprising a plurality of pressure plates having grooved faces, interiorly unobstructed frame members disposed between adjacent pressure plates, a textile.

filtering material adjacent the faces of said pressure plates and a paper filtering material overlying said textile filtering material and contiguous to said frame members, said paper being thus directly exposed to the supply of oil to be filtered so that the resultant cake may be removed therewith.

WILLIAM D. HARRIS. 

